There are combo products on the market from many pet brands like Total-Zymes Plus Probiotics. I like to use a product that has several strains of organisms in it. If you read the ingredient list of the Total-Zymes products, you can get an idea of what I’m talking about. That being said, human products are less expensive and you can also give it to your dog. You can use sardines and even mackerel instead of salmon. I feed raw sardines.